Tool-guard.



E. A. MR'HN.

TOOL GUARD.

APPLICATION FILED SEPT. 2 1.. 191s.

Patented June 25, 1918.

2 SHEETS-SHEET l.'

Zd@ AW` E. A. MARTIN.

TooL GUARD.

APPLICATION FILED SEPT. ZI. |916.

.Patented June 25, 1918.

, 2 SHEETS-SHEET 2.

v liability of injury :to the operator 'b' the y imponen.

arrancar. a. rraarrN, or ,nrrrsnuaeir rnNNsNLvaNra.

To all.4 whom it may concern:

Be it known that l,' lElMANUnL A. MnTIN, acitizen of the United States,and resident -of Pittsburgh, inthe county of. Allegheny and 4State'orPennsylvania, have invented a new and useful Improvement TOOL' Guards;and I do hereby declare the following to be a full, clear, and exactdescrlptlon My invention I relates to portable circulars saw guards,and;v has particular, although not exclusive, reference to portable'saws and like tools known as hand tools.

The inventionis illustrated. in connection with a portable circular handsaw, such tool comprisin a circular-sawmounted on a spindle journa ed ina frame, ands'aid frame supportin .an electric motor .which is connectedby "gearing or like connections -for driving" the saw', 'the motorreceiving the current through a suitable Hexible conductor. Handlesareprovidedfor manipulatm the tool,

"mand one nfl-these handles, usually t e handle current to the motor.

longitudinally ofthetool, is provided with aswitch which-'isfinger-.pressed to supply ln the operation of the tool the 'operatorgrasps the'handles'. and at the Same time closes vthe switch to'supplycurrent tothemotor.. llt has been foun thatthere' is great f revolvingsaw when the saw is with rawn and in handlin the saw'vvhen` notin sawingposition` w 'le the. power is" on, and also: through `accldent. .r t.

The object 'of theinventlon 1s vto provide protecting means which willat all times pref vent contact with the saw blade when it v1s`in motionand which ermlts'Y ready use `of 'the vsaw, and .which e ectively actsasia guard during sawing'operations.

In the accompanylng drawings, Figurey 1V is aside viewof a ortablecircular'l handsawg-Fig. 2 is afp an view off' the same;V Fig. 3 is-anend view; Fmg. 4 1s al verticalsection taken on the center lineL of the`saw looking towardthe motor; Fig. 'is an end view similar to lFig. 3,and shows the tool fa single member attached by flanges 15?1 se!" 'fueThe lower half or cutting side of the saw 1 z 1s .protected byswingingguard-members 171' close guarding in sawing operation;l andFigs. 6 and 7 are 55 -v detail views of the guard' actuating mechanlsm.

The numeral 2 indicatesv a suitable portableV -circularhand-saw'comprising a bifurcated frame-2a and linto which is mounted tthe circular saw 3. The saw is mounted on a shaft journ'aled in suitablebearings andl has secured thereto a bevel ear 4 which is 1n mesh withthe bevel plnion 5 on the shaft 6.,

This shaft is journaled in thev frame and Specication of Letters 'Patent'.Pwtnmbngdl 11T 11111;@25 jllltll, f application tiled September 21,1916. Serial No. 121,436. l

35 may be driven from .the motor' in any suit' able manner, preferably,however, direct connectionto the motor Shaft is made-whenv thecutting-toolis a saw, and the motorjn this instance is indicatedgenerally .as at 7 andis connected tothe frame as at 8. The motor isprovided with the handle 9 andthe frame is provided with bosses 10adapted to receive the ,handle 11 in either a right-V handed or aleft-handed position.

`lln order to operate these tools electrically,

suitable switch mechanism is provided which may be 'convenientlycontrolled by the operator; such a switch is indicated in the drawing asa push button 12 covered by a' guard piece 13. v

Current is sinoplied to the motor by the flexible conductor 14.

The saw-blade extending above the frame4 .is covered by' a guard-member15 which is rigidly secured `to said frame in any desired manner andmayjbe made 1n' one or several p1eces, the constructlon shown consistingof cured by screws 16.

two of such members are shown, one each wise contact with the saw, andprovide for of the lower center of the position. Fig. 3 it willl benoticed that these guardsaw in close ,members are attached s as to lieinplanes converging toward the bottom of the saw.

This converging of the guard-membersis a .very important feature of theinvention, as 4`lby 'this arrangement accidentalspreading By referringto.

This plate'is mounted on displacement by contact edgewise'uwith theguards .is revented, as the natural line of force vapplied at'the edgewould act to move 1. the -guards may f. closed by gravity.

members by trigger mechanism `be conveniently and naturally operated bythe hand while holding' the guards toward the saw.

e guards are held closed by coil-springs 20, 4in a manner which is -wellunderstood. Other closing devices may be employed, or becounter-weighted and In the operation of sawing or using a circularcutting tool of this nature, the lower protecting-guards must'bel raisedor moved to permit contact of the cuttin toolwith the work, and intprovision is made to separate edge of the is instance,

which .ma

tive position. v

The guards areprovided with projecting .plates orear-portions 22-between which is disposed and mounted to rotate horizontally,

the' spreader-plate 23, A'moditied formfotthis plateis shown in Fig. 7hieh is provided with antifriction rolls 23a..

naled in thee'nd of the saw-frame, and has attached; to its vopp'c )siteend the crank-arm 26. The operating-trigger 27. is mounted- Vand adaptedto 28 which is connected to or is partof the slide in an openslotted luframe, the trigger being held in' said slotby connected to the crank-armtion to permit full closing Pulling on the trigger rotates thevspreader-- 'plate which forces apart the is fashioned into a form whichadapts it for Aor .."left-handed position.` The .trigger is 'bypivot-bolt 29,

and is provided with the spring 3Q which is interposed vbetween the'lug28 and ashoulder.

` The 'spring' 30y or stopv 31 on the trigger. normally acts to holdthelspreader in a posi- .of. the guards.

guard-members against the tension of springs. 20; spring 30 being putunder-tension by: this operation will return the plate to .its normalposition when the tri guardsagain. From the foregoing description, itwill b 'e seenthat the operator need 'rotate-fthe spreader throughtrigger movement-.',only

lfar enough to separate the guards to expose the s aw to, the work, and,in so doing-move the guards in such position that v v'hen brought'intocontact with the work', as shown -in Figs. 3 and 5, they will naturallyyield upwardly as the depth of thefsaw cut in-l creases. The ventsidewise guards in this position prethe guardy lines 'in Fig. 6.

the tool in operation. The device is4 a shaft 24. Jour',-

l gger isi-released by the tingen* and the spr1ngs'20 will act t'oclosethe. Id

-for spreading. said apprOaCh tothe saw, and

close automaticallyl when' the sawf-is1-zivithdrawn from the cut,-orming 'guards'againsl edgewise contact.v

The spreading `nie-.hailism iis so' devised that the trigger maybe-readily operated 'at the opposite side of the frame for 'lefthand useof the tool; and' in Fig. 6', I have'.illus 1 i trated in dotted linesthe. left-hand position 4of these parts, it being understood that. 'thehandle l1 will also be transferred to that -side of the frame. This isaccomplished in" the following manner Pivot 29is removed to permitseparation 'of the trigger and arm, and these parts are then transposedto an opposite position, as clearly shown by dotted .By my invention,for portable circular-saws or like cuttingtools, which forms a completeguard' against contact withthe cutting edge of the saw or tool when thesaw or tool -is out ofthe work, vand the swinging guards providesuicient the saw sidewise when the saw is'in4 opera'- simplev inconstruction; is not liable to get out of order; andcan be easivl andcheaply produced.

form of actuatingmechanism for operating g the guards,

it is to.be understood that this .operation may be accomplished invarious .ways, 'a nd the mechanism altered in details andrelative'arr'angement of parts, Within' the scope of the appendedclaims.

What I claim is: .1. In a portable rotary-.disk cutting-tool, thecombination of .a rotary cuttingdisk and a longitudinally-divided guardlfor covering the -cutting portions of said disk, the divided portions'ofy said' swing laterally out of the way of the cutting -guard beingadapted to pathof the disk..

2. In a portablerotary-disk cutting-tool, the combination of a rotarycutting-disk andv a longitudinally=divided yieldable guard covering thecutting portionof saiddisk, the divided portions of said guard beingadapted to yieldto exposey the cuttingdisk for the cutting operation. .l

3'. a portable rotary-disk cutting-tool, .the combination of a rotarycutting-disk and isk comprising swinging guard ,members I arranged ytoseparate in order to permit of the cutting operation. l

4:.'` In a `portable rotary cutting-disk tool,

the combination of a rotary cuttinggdisk, andl a guard for'inclosing'the cutting. portion of' said diskcomprising hingedmembers adapt ed toswin away from said disk, and-means members.

' 5, In a portable rotary cutting-disk tool,

the combination ofa rotary cutting-disk, and

a guard for inclosin thecutting portion of -said disk comprising hingedI provide asafety guard e I have herein described a particular swinging'protection to prevent accidental contact with aguardinclosing thecutting portion of said l' t imonaoall `guard-members, and means fornormally -holding closed, said members, and means Vfor Spreading saidlmembers to expose the disk tion of said diskI comprising swinging.guard-members, one' member each side of said disk, and meansfinterposedVbetween said members for separating said membersvto expose the disk tothe Work.V ,t

7.- In a portable rotaryjcutting-tool, the' combination of a rotarycutting-disk mount,- ed in a' frame, a guard for the cutting portion ofsaid disk comprising swinging guardmembers hingedto said frame, saidguardmembers normally lying in. converging planes,l one member each sideof said disk,

- A. MARTIN, have hereun and actuating means carried `by the frame forinitially separating the guardanembers to'expose the cutting portion ofthe disk to the Work;

8. lln a portable rotary cutting-disk tool, the combination vof a rotarycutting-,disk mounted in a frame, a guard for inclosing the cuttingportion of saidv disk comprising hinged swinging guard-members, one 1n1nber eachl side' of said disk, a spreader interposed between saidguard-members, and

vmeans carried by the frame for actuating said spreader. y

n testimony whereof, I the said EMANUEL set my hand. EMANUE A. MARTllN.Witnesses: c 'l TOEN F.'..WILL, Jl. R. Kama.

